n.timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial

SUNDIALS
On sundials, springs, and atoms.
From sundials to atomic clocks.
Greek and Roman sundials
FromSundialstoAtomicClocks, UnderstandingTimeandFrequency
From Sundials to Atomic Clocks: Understanding Time and Frequency
SUNDIALS: Suite of nonlinear and differential/algebraic equation solvers
Rsundials: Suite of Nonlinear Differential Algebraic Equations Solvers in R
Cvodes, the sensitivity-enabled ode solver in sundials
The Origins of al-Bīrūnī‘s “Method of the Zijes” in The Theory of Sundials